#include <QCoreApplication>
#include <iostream>
#include <cmath>
using namespace std;

int main(int argc, char *argv[])
{
    QCoreApplication f(argc, argv);
    cout<<"Vvedite radius okruzhnosti: ";
    int a;
    cin>>a;
    cout<<"Dlina okruzhnosti: "<<2*M_PI*a<<", ploshad' kruga: "<<M_PI*(a*a);
    return f.exec();
}
